Webarchitects are able to provide long term archiving of websites as static HTML with free archived.website sub-domains.

We can use software (usually HTTrack)
to download dynamic sites as static HTML and then edit this archive to fix any
issues. We provide a free sub-domain on our archived.website domain,
example.org.archived.website (or we can use a sub-domain or your
domain, for example archive.example.org).

We charge at our usual hourly rate for archiving and
HTML / CSS editing work, one or two hours is usually enough to archive a
site.